CN104754741B - A kind of method of determining search space - Google Patents
A kind of method of determining search space Download PDFInfo
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- CN104754741B CN104754741B CN201310753313.XA CN201310753313A CN104754741B CN 104754741 B CN104754741 B CN 104754741B CN 201310753313 A CN201310753313 A CN 201310753313A CN 104754741 B CN104754741 B CN 104754741B
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- physical downlink
- downlink control
- repetition period
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
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Abstract
A method of in a wireless communication system determine Physical Downlink Control Channel search space, wherein the Physical Downlink Control Channel time domain periodic repetition, the method it is characterized in that：Within the repetition period of the Physical Downlink Control Channel, the initial position of the search space of the Physical Downlink Control Channel is constant.
Description
Technical field
The present invention relates to field of communication technology more particularly to wireless communication technology fields.
Background technology
In wireless communication field, in recent years, machine type communication (Machine Type Communication abbreviation MTC)
Just receiving lasting concern.Some MTC devices, typically such as intelligence instrument, needs to be mounted on basement, therefore what is be subject to wears
Loss is very big thoroughly, so that these equipment possibly can not be connected effectively with the network equipment.Thus 3GPP has opened up one specially
It is directed to the project for the coverage area for increasing inexpensive MTC device.Its target is to increase the coverage area of such MTC device to reach
15dB。
In existing 3GPP specifications, data transmission is to be based on Physical Downlink Control Channel (Physical Downlink
Control Channel, abbreviation PDCCH) be scheduled.And in order to realize the covering gain of 15dB in MTC device, it is right
The PDCCH signals answered are expected to repeat to transmit up to a hundred times.Using higher aggregation level (Aggregation Level abbreviation AL)
Number of repetition can be reduced to a certain extent to save the power consumption of equipment, however, the realization of generally covering gain must
It must be dependent on PDCCH signals being repeated cyclically in the time domain.
In current specification, the user equipment (User Equipment abbreviation UE) including MTC device can be at one
The signal of all possible PDCCH channels of blind decoding is to find that PDCCH channel for dispatching itself in subframe.And it is every
The position of a occupied control channel unit of PDCCH channels (Control Channel Element abbreviation CCE) and quantity exist
Each subframe can change, to avoid continuous congestion.For the same reason, the search space of each PDCCH channels
(search space) is also to be changed as unit of subframe.This variation is with certain hash function (hash function)
Come what is realized, to provide randomness to a certain degree to avoid continuous congestion.
Be not difficult to find out, between existing search space mechanism and PDCCH signals being repeated cyclically in the time domain there is
Certain contradiction.When PDCCH signals need to be repeated in a subframes up to a hundred, and the search space of each subframe is different
In the case of, in all subframes that above-mentioned MTC device must be within the repetition period all possible PDCCH channels of blind decoding with
Find the PDCCH channels that is repeated but search space changes always.Obviously, this considerably increases what MTC device was realized to answer
Miscellaneous degree；Inexpensive with MTC device itself, the design concept easily realized is inconsistent.
So the target of the present invention is exactly to find a kind of method in novel determination PDCCH channel search space；This side
Method is required to the case where being repeated cyclically in the time domain suitable for PDCCH signals, to realize that the covering of MTC device increases
Benefit；Also wanting can not be excessively complicated, in order to avoid increase the cost of MTC device；It simultaneously also wants that existing specification can be compatible with as far as possible, keep away
The change exempted to existing protocol is excessive.
Invention content
To solve the above problem in the prior art, the present invention proposes a kind of novel determination PDCCH channel search space
Method.By the way that the search space changed based on subframe is changed into the search space changed based on the repetition period, reached with
Simple mode realizes PDCCH signals being repeated cyclically in the time domain, to solve the above problem present in existing specification.
Specifically, according to the first aspect of the invention, it is proposed that a kind of to determine physical down control in a wireless communication system
The method of the search space of channel processed, wherein the Physical Downlink Control Channel time domain periodic repetition, the method its
It is characterized in that：Within the repetition period of the Physical Downlink Control Channel, the search space of the Physical Downlink Control Channel
Initial position is constant.
Preferably, the physics is determined using with the repetition period of the Physical Downlink Control Channel relevant hash function
The initial position of the search space of down control channel.
It is highly preferred that determining the initial position of the search space of the Physical Downlink Control Channel using following formula：
Wherein, L represents aggregation level；YjRepresent the repetition period relevant Kazakhstan with the Physical Downlink Control Channel
Uncommon function；M=0 ..., M-1, M represent the quantity of the possible Physical Downlink Control Channel；NCCE,kRepresent control in subframe k
The sum of Channel Elements, i=0 ..., L-1.
It is highly preferred that described and Physical Downlink Control Channel repetition period relevant hash function YjFor：
Yj=(AYj-1)modD
Wherein, Y-1=nRNTI, nRNTIRepresent radio network temporary identifier；A=39827；D=65537；J passes through following public affairs
Formula determines：
Wherein, SFN represents System Frame Number；R represents the repetition period of the Physical Downlink Control Channel；,
Ns represents the timeslot number in radio frames.
It is highly preferred that described and Physical Downlink Control Channel repetition period relevant hash function YjFor：
Yj=(AYj-1)modD
Wherein, Y-1=nRNTI, nRNTIRepresent radio network temporary identifier；A=39827；D=65537；J passes through following public affairs
Formula determines：
Wherein, SFN represents System Frame Number；R represents the repetition period of the Physical Downlink Control Channel；
Ns represents the timeslot number in radio frames；k2iIt is determined by following equation：
(10*SFNi+ni+k1i)MOD(R+k2i)=0
Wherein, SFNiRepresent the System Frame Number of the repetition period of i-th of Physical Downlink Control Channel；niIt represents i-th
Initial subframe number in the repetition period of the Physical Downlink Control Channel；R represents the repetition of the Physical Downlink Control Channel
Period, k1iAnd k2iRepresentative and niRelevant offset.
It is highly preferred that reserving physical resource for public search space.
It is highly preferred that determining the initial position of the search space of the Physical Downlink Control Channel using following formula：
Wherein, L represents aggregation level；YjRepresent the repetition period relevant Kazakhstan with the Physical Downlink Control Channel
Uncommon function；M=0 ..., M-1, M represent the quantity of the possible Physical Downlink Control Channel, NCCE,kRepresent control in subframe k
The sum of Channel Elements；nCCE,CSSIt is represented as the reserved control channel unit of public search space, i=0 ..., L-1.
Preferably, within the repetition period of the Physical Downlink Control Channel, multiple aggregation levels can be configured.
It is highly preferred that within the repetition period of the Physical Downlink Control Channel, multiple described search spaces can be configured.
It is highly preferred that the control channel unit in composition described search space is non-continuously distributed, which is characterized in that described
Being distributed in for control unit is constant in the repetition period of the Physical Downlink Control Channel.
In the present invention, changed by designing new function and search space was transformed into based on the repetition period, to realize
Search space remains unchanged in one repetition period so that the realization of MTC device blind decoding operation greatly simplifies；It protects again simultaneously
It has demonstrate,proved that search space is different on the different repetition periods, therefore has avoided the appearance of Persistent Congestion；In preferred scheme,
The resource that public search space can also be reserved realizes the purpose of flexible dispatching, also avoids to other types user equipment
It influences；And it has been compatible with existing specification to the greatest extent, the excessive change to agreement is avoided, to reach the present invention's
Purpose.
Description of the drawings
The following detailed description to non-limiting embodiment is read by referring to accompanying drawing, gives other spies of invention
Sign, purpose and advantage will will become more apparent.
Fig. 1 shows a kind of flow chart of determining PDCCH channel search space-wise according to the present invention.
Wherein, same or analogous reference numeral indicates same or analogous steps characteristic or device/module.
Specific implementation mode
It, will be with reference to the appended attached drawing for constituting a present invention part in the specific descriptions of following preferred embodiment.Institute
Attached attached drawing, which has been illustrated by way of example, can realize specific embodiment.Exemplary embodiment is not intended to
Limit all embodiments according to the present invention.It is appreciated that without departing from the scope of the present invention, other can be utilized
Embodiment can also carry out structural or logicality modification.Therefore, it is below specific descriptions and it is unrestricted, and this
The range of invention is defined by the claims appended hereto.
First, in existing 3GPP specifications, the search space of PDCCH channels is defined by following formula：
Wherein, L represents aggregation level AL；YkRepresent some hash function；M=0 ..., M-1, and M represent it is possible
The quantity of PDCCH channels；NCCE,kRepresent the sum for the CCE for including in subframe k, i=0 ..., L-1.And wherein YkIt represents
Hash function is as follows defined in existing specification：
Yk=(A, Yk-1)modD (2)
Wherein, Y-1=nRNTI, nRNTI represents radio network temporary identifier (radio network temporary
Identifier abbreviation RNTI)；A=39827；D=65539；, time slot of the ns representatives in the radio frames
(slot) number.From formula (2) as can be seen that the hash function Y of present Normalization rulekIt is to be changed based on subframe, i.e., each not
In same subframe, the positions starting CCE of the search space of the same PDCCH channels are all different.
Therefore, it is proposed to a kind of modification in above-mentioned PDCCH channel search space according to the present invention, i.e., when some PDCCH believes
Road is in the repetition of time domain periodic, in each subframe within a repetition period of the PDCCH channels, the PDCCH channels
The positions starting CCE of search space be all constant.
Attached drawing 1 shows a kind of stream of determining PDCCH channel search space-wise according to the present invention
Cheng Tu includes the following steps：
S11. within the repetition period of the Physical Downlink Control Channel, the search space of the Physical Downlink Control Channel
Initial position it is constant.
Specifically, according to one embodiment of present invention, it is proposed that by the hash function Y based on subframekIt is substituted for and is based on
The hash function Y of PDCCH channel repeat periodsj.Use YjPurpose be that can ensure that search space is constant within the repetition period,
Random distribution to a certain degree can be realized between the repetition period again, to reduce the probability of congestion generation.In this way, new search
Space can be expressed as following formula：
Wherein, L represents AL；YjRepresent the repetition period relevant Hash letter with the Physical Downlink Control Channel
Number；M=0 ..., M-1, M represent the quantity of possible PDCCH channels；NCCE,kThe sum of control Channel Elements in subframe k is represented,
I=0 ..., L-1.It must be noted that formula (3) is a kind of realization side of the method for determining search space according to the present invention
Formula, other any uses determine that the formula of search space can reach identical effect based on the hash function of repetition period
Fruit, thus belong to protection scope of the present invention.
Further, according to another embodiment of the invention, the Y in formula (3)jIt can be expressed as following formula：
Yj=(AYj-1)modD (4)
Wherein, Y-1=nRNTI；A=39827；D=65537；J is determined by following equation：
Wherein, SFN represents System Frame Number；R represents the repetition period of PDCCH channels；K=Ns represents radio frames
In timeslot number.From formula (5) as can be seen that due to introducing repetition period R, in each repetition period R, each height
The positions starting CCE of search space on frame are all identical；And between different repetition period R, the starting of search space
The positions CCE are then different.For example, in the case of R=50, in preceding 50 subframes, PDCCH channel search space is risen
Beginning CCE position is all identical；And to the 51st subframe, the positions starting CCE in PDCCH channel search space are changed, and
This latter is then kept to originate the positions CCE until the 100th subframe, and and so on.
It is furthermore preferred that in order to be further reduced the probability that congestion occurs, according to another embodiment of the invention, Ke Yi
Each repetition period changes the hash function used when end, i.e., come using different hash functions in each repetition period
Determine search space, and all these hash functions are all based on the repetition period.One given below is based on the embodiment
Hash function formula：
Yj=(AYj-1)modD (4-1)
Wherein, Y-1=nRNTI, nRNTIRepresent radio network temporary identifier；A=39827；D=65537；J passes through following public affairs
Formula determines：
Wherein, SFN represents System Frame Number；R represents the repetition period of the Physical Downlink Control Channel；,
Ns represents the timeslot number in radio frames；k2iIt is determined by following equation：
(10*SFNi+ni+k1i)MOD(R+k2i)=0 (6)
Wherein, SFNiRepresent the System Frame Number of the repetition period of i-th of Physical Downlink Control Channel；niIt represents i-th
Initial subframe number in the repetition period of the Physical Downlink Control Channel；R represents the repetition of the Physical Downlink Control Channel
Period, k1iAnd k2iRepresentative and niRelevant offset.From formula (6) as can be seen that due to introducing offset k2i, therefore by
The parameter j that formula (5-1) obtains is different from each repetition period R, so that the public affairs used on each repetition period R
Formula (4-1) also becomes different.Higher randomness has been achieved, can be effectively prevented that there is a situation where congestions.
In addition, it is contemplated that the repetition transmission of PDCCH certainly will occupy a large amount of channel resource, system is inevitably improved
Congestion Level SPCC, in extreme situations, it could even be possible to influencing the public search space (Common of public control channel
Search Space abbreviation CSS).And it is well known that CSS is important system resource, it is necessary to try to reduce the repetition pair of PDCCH
Influence caused by it.Therefore, according to another embodiment of the invention, propose true using the hash function based on the repetition period
On the basis of the method for determining PDCCH channel search space, physical resource is reserved for CSS, the resource that CSS is used is made not to be repeated hair
Occupied by the PDCCH sent, thus the repetition for avoiding PDCCH sends the influence to CSS.
Further, according to another embodiment of the invention, search space can be expressed as following formula：
Wherein, L represents AL；YjRepresent the repetition period relevant hash function with PDCCH；M=0 ..., M-1, M are represented
The quantity of the possible Physical Downlink Control Channel, NCCE,kRepresent the sum of CCE in subframe k；nCCE,CSSIt is reserved to be represented as CSS
CCE, i=0 ..., L-1.Obviously, other hash functions of any use based on the repetition period, and reserve physics money for CSS
The formula of the determination search space in source can reach identical effect, thus belong to protection scope of the present invention.
In addition, in order to meet the needs of flexible dispatching, it according to another embodiment of the invention, can also be in a MTC
Multiple and different repetition periods is configured in equipment, or configures multiple AL on a repetition period, it in this case, should
MTC device needs to carry out blind decoding operation on this multiple repetition period to obtain corresponding PDCCH signals.
And in order to improve the service efficiency of channel resource, it according to another embodiment of the invention, can also be in a weight
Multiple search spaces are configured on the multiple period.For example, can be by all subframes in a repetition period by the odd even point of subframe numbers
At two groups, every group is respectively used to different search spaces, and MTC device is also accordingly by the signal received by the strange of subframe numbers
It is even to merge respectively, and blind decoding is carried out to obtain corresponding PDCCH signals.
Finally, in order to be further reduced the probability that congestion occurs, another reality according to the present invention forms search space
CCE can be continuously distributed with right and wrong, as long as ensureing that being distributed in for these CCE is constant in the repetition period R of PDCCH.Citing
For, as AL=8, search space occupies 8 CCE, and this 8 CCE logically can be continuously distributed with right and wrong, for example is
4 CCE are spaced between being divided into two groups of 4 mono- group of CCE, two groups.As long as ensureing in the same repetition period R, each subframe
This upper 8 CCE are to be distributed in this way, just the method for the equally applicable present invention.
The embodiment of the present invention is described above, but the invention is not limited in specific system, equipment and
Specific agreement, those skilled in that art can make various deformations or amendments within the scope of the appended claims.
The those skilled in the art of those the art can be by studying specification, disclosure and attached drawing and appended
Claims, understand and implement other changes to the embodiment of disclosure.In the claims, word " comprising " is not arranged
Except other elements and step, and wording "one" be not excluded for plural number.In the present invention, " first ", " second " only indicate name
Claim, does not represent orbution.In the practical application of invention, the possible perform claim of a part multiple skills cited in requiring
The function of art feature.Any reference numeral in claim should not be construed as the limitation to range.
Claims (9)
1. a kind of method for the search space determining Physical Downlink Control Channel in a wireless communication system, wherein the physics
Down control channel in the time domain within the repetition period repeat, the method it is characterized in that：
Using with the repetition period relevant hash function, determine the Physical Downlink Control Channel within the repetition period
Search space starting control channel unit CCE position so that the institute of the search space of the Physical Downlink Control Channel
The position for stating starting CCE is constant within the repetition period.
2. according to the method described in claim 1, wherein, the search of the Physical Downlink Control Channel is determined using following formula
The position of the starting CCE in space：
Wherein, L represents aggregation level；YjRepresent the repetition period relevant Hash letter with the Physical Downlink Control Channel
Number；M=0 ..., M-1, M represent the quantity of the possible Physical Downlink Control Channel；NCCE,kRepresent control channel in subframe k
The sum of unit, i=0 ..., L-1.
3. described relevant with the repetition period of the Physical Downlink Control Channel according to the method described in claim 2, wherein
Hash function YjFor：
Yj=(AYj-1)modD
Wherein, Y-1=nRNTI, nRNTIRepresent radio network temporary identifier；A=39827；D=65537；J is true by following equation
It is fixed：
Wherein, SFN represents System Frame Number；R represents the repetition period of the Physical Downlink Control Channel；Ns generations
Timeslot number in table radio frames.
4. described relevant with the repetition period of the Physical Downlink Control Channel according to the method described in claim 2, wherein
Hash function YjFor：
Yj=(AYj-1)mod D
Wherein, Y-1=nRNTI, nRNTIRepresent radio network temporary identifier；A=39827；D=65537；J is true by following equation
It is fixed：
Wherein, SFN represents System Frame Number；R represents the repetition period of the Physical Downlink Control Channel；Ns generations
Timeslot number in table radio frames；k2iIt is determined by following equation：
(10*SFNi+ni+k1i)MOD(R+k2i)=0
Wherein, SFNiRepresent the System Frame Number of the repetition period of i-th of Physical Downlink Control Channel；niIt represents described in i-th
Initial subframe number in the repetition period of Physical Downlink Control Channel；R represents the repetition period of the Physical Downlink Control Channel,
k1iAnd k2iRepresentative and niRelevant offset.
5. according to the method described in claim 1, it is characterized in that, reserving physical resource for public search space.
6. according to the method described in claim 5, wherein, the search of the Physical Downlink Control Channel is determined using following formula
The initial position in space：
Wherein, L represents aggregation level；YjRepresent the repetition period relevant Hash letter with the Physical Downlink Control Channel
Number；M=0 ..., M-1, M represent the quantity of the possible Physical Downlink Control Channel, NCCE,kRepresent control channel in subframe k
The sum of unit；nCCE,CSSIt is represented as the reserved control channel unit of public search space, i=0 ..., L-1.
7. according to the method described in claim 1, wherein, being configured within the repetition period of the Physical Downlink Control Channel multiple
Aggregation level.
8. according to the method described in claim 1, wherein, being configured within the repetition period of the Physical Downlink Control Channel multiple
Described search space.
9. according to the method described in claim 1, wherein, the control channel unit in composition described search space is non-continuously distributed
, which is characterized in that being distributed in for the control channel unit is constant in the repetition period of the Physical Downlink Control Channel.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753313.XA CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
| PCT/IB2014/003070 WO2015101833A1 (en) | 2013-12-31 | 2014-12-17 | Method for determining search space |
| TW103144086A TW201528748A (en) | 2013-12-31 | 2014-12-17 | Method for determining search space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310753313.XA CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
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| CN104754741A CN104754741A (en) | 2015-07-01 |
| CN104754741B true CN104754741B (en) | 2018-08-14 |
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| CN201310753313.XA Active CN104754741B (en) | 2013-12-31 | 2013-12-31 | A kind of method of determining search space |
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| CN (1) | CN104754741B (en) |
| TW (1) | TW201528748A (en) |
| WO (1) | WO2015101833A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106911999A (en) * | 2015-12-23 | 2017-06-30 | 中兴通讯股份有限公司 | The determination method and device of search space in narrowband systems |
| GB201602150D0 (en) | 2016-02-05 | 2016-03-23 | Nec Corp | Communication system |
| CN107332796B (en) * | 2016-04-29 | 2021-11-02 | 中兴通讯股份有限公司 | Blind detection and uplink access method and device, receiver, transmitter and base station |
| CN108432317B (en) * | 2016-06-17 | 2020-11-17 | 华为技术有限公司 | Paging message transmission method, first equipment and second equipment |
| CN108882204B (en) * | 2017-05-16 | 2020-11-24 | 电信科学技术研究院 | Method and base station for determining repetition times of machine type communication downlink control channel |
| ES2970369T3 (en) | 2017-10-02 | 2024-05-28 | Ericsson Telefon Ab L M | PDCCH supervision periodicity |
| CN110034863B (en) * | 2018-01-12 | 2020-10-23 | 华为技术有限公司 | Data packet transmission method and communication device |
| US10880878B2 (en) * | 2018-02-16 | 2020-12-29 | Qualcomm Incorporated | Physical downlink control channel hash function update |
| CN110492972B (en) * | 2018-05-14 | 2022-02-08 | 北京小米松果电子有限公司 | Blind detection control method, device, base station, user equipment and storage medium |
| CN110536420B (en) * | 2018-05-23 | 2022-04-01 | ***通信有限公司研究院 | Method and equipment for configuring time domain detection position of physical downlink control channel |
| CN111147204B (en) * | 2018-11-02 | 2021-06-22 | 华为技术有限公司 | Communication method, communication apparatus, and storage medium |
| CN114788371A (en) * | 2019-12-19 | 2022-07-22 | 华为技术有限公司 | Resource determination method and resource determination device |
| CN117014908A (en) * | 2020-04-24 | 2023-11-07 | 展讯半导体(南京)有限公司 | Method, system, electronic device and storage medium for monitoring paging message |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2015101833A1 (en) | 2015-07-09 |
| TW201528748A (en) | 2015-07-16 |
| CN104754741A (en) | 2015-07-01 |
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